While Abzan Aristocrats seems like a fairly competitive way to play with Death's Oasis, the Cat Oven engine is tier one in Standard and has been for a while
Emrakul has come to wreak havoc on the residents of Innistrad
With Vintage allowing single copies of more powerful cards, Legacy rules them out entirely and levels the playing field a little more
When you search your library this way, put a +1/+1 counter on target creature you control
This demands players to judiciously manage their resources, ensuring the efficient casting of spells while strategically countering the actions of their opponent
Based on the league results, and until the banlist is expanded to weaken Blue, the only good decks that can be played in this format will be mono-blue, or heavy on blue.